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F. The upper two thin-walled chambers of the heart. (------------------------------)

Rows of parenchyma cells that are present between xylem vessels. | Exists at the center of the stem. It is composed of parenchyma cells for storage. | Water column ascends through xylem vessels depending on three principal forces that pull water upwards to very high levels that may reaches 100 meters. | Each sieve tube has a nucleated companion cell. Vital functions of the sieve tube are organized by ribosomes and mitochondria present in the companion cell. | B. One row of adjacent, barrel-shaped parenchyma cells in the stem, the outer walls of which are covered by cutin. (-----------------------------) | B. Rising of water through tiny tubes. (---------------------) | K. Root pressure does not explain the ascent of water to high levels in tall trees. | G. The experiment done by Mittler to prove the role of sieve tubes in translocation of high-energy food. | Absorbed food as (sugar, amino acids) | Oxygenated blood returns from the lungs through the 4 pulmonary veins (two veins from each lung) to open into the left atrium. |


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G. The lower two thick-walled chambers of the heart. (------------------------------)

H. A valve which is made up of 3 flaps that guards the opening between the right atrium and the right ventricle. (------------------------------------)

I. A valve which is made up of 2 flaps that guards the opening between the left atrium and the left ventricle. (--------------------------------)

J. Blood vessels that carry blood from the heart to other organs. (----------------------)

K. Blood vessels that carry blood from the body organs to the heart. (-----------------)

L. The tissue that forms the outer layer of the arterial wall. (--------------------------)

M. The tissue that forms the middle layer of the arterial wall. (-------------------------)

N. The inner layer of the arterial wall. (--------------------------)

O. The artery that carries deoxygenated blood. (---------------------------)

P. The veins that carry oxygenated blood. (------------------------------)

Q. The blood vessels that are actually buried among the body muscles. (--------------)

r. The blood vessels that don’t pulsate. (-------------------------)

S. Tiny microscopic vessels that connect the arterioles with the venules. (-------------)

T. Thickness of the wall of the blood capillary in microns.(---------------------)

U. The diameter of the blood capillary in microns. (---------------------)

V. A liquid tissue that runs inside the human body. (----------------------)

W. The principal medium in the process of transport in Man. (----------------------)

X. Volume of blood in the human body in liters on average. (--------------------)

Y. The PH value of human blood. (-----------------------)

Z. Substances that are transported by blood. (--------------------------------)

A. Its formation leads to protection of the blood against bleeding. (------------------)

B. Percentage of blood plasma in blood. (--------------------------)

C. Inorganic salt ions present in the blood plasma. (---------------------------------)

D. Proteins in the blood plasma. (----------------------------------)

E. A component of the human blood which is parts of cells produced in bone marrow and important in blood clotting. (-----------------------------)

F. Blood cells with no nuclei. (-----------------------------)

G. Blood cells containing Hemoglobin. (----------------------------)

H. Blood cells that contain a nucleus for each. (----------------------------)

I. Count of Erythrocytes per mm3 of the human blood. (------------------------)

J. Count of Leucocytes per mm3 of the human blood. (-------------------------)

K. Count of blood platelets per mm3 of the human blood. (--------------------------)

L. A specialized bundle of thin cardiac muscular fibers buried in the right atrial wall near its connection with the large veins. (-------------------------)

M. A node at the junction between the two atria and the two ventricles. (-------------)

N. The wall in between the two ventricles. (--------------------------)

O. A nerve which is connected to the pacemaker of the heart, and slows down the heart beats. (-----------------------------)

P. A nerve which is connected to the pacemaker of the heart, and accelerates heart beats. (-----------------------------)

q. Number of heart beats / minute in average. (-----------------------)

R. The conditions that lead to an increase in the heart beats. (-----------------------)

S. The conditions that lead to a decrease in the heart beats. (------------------------)

T. The sound of the heart beat which is long and low-pitched. (------------------------)

U. The sound of the heart beat which is short and high-pitched. (----------------------)

V. The source of lubb sound of the heart beat. (-----------------------)


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Thromboplastin| W. The source of dupp sound of the heart beat. (-----------------------)

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